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Transmission device

A transmission device, nonlinear distortion technology, applied in the parts of amplifying device, phase modulation carrier system, digital transmission system and other directions

Inactive Publication Date: 2009-08-05
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As mentioned above, in order to compensate the nonlinear distortion, the conventional transmission device feeds back the synthesized signal of the output modulation signal output to the outside and the nonlinear distortion component generated in the transmission system circuit. Therefore, the A / D conversion of the feedback system circuit The device must have a wide dynamic range

Method used

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no. 1 Embodiment

[0026] figure 1 is a block diagram of a transmission device according to the first embodiment of the present invention. figure 1 The transmission device shown includes: an instantaneous power calculation unit 102 for calculating the instantaneous power 103 of a digital quadrature baseband transmission signal 101, a compensation coefficient reference unit 104 for referring to nonlinear distortion compensation data, and an output and compensation coefficient reference unit 104. Referring to the reference table 106 of the nonlinear distortion compensation data 107 corresponding to the address 105, the non-linear distortion compensation for the digital quadrature baseband transmission signal 101 is performed using the orthogonalized nonlinear distortion compensation data 108 from the compensation coefficient reference unit 104. The linear distortion compensator 109, the first quadrature modulation unit 111 that performs quadrature modulation on the quadrature baseband signal 110 a...

no. 2 Embodiment

[0040]The transmitting device of the second embodiment of the present invention does not use the reference table 106, but is constructed by calculating the calculation formula possessed by the compensation coefficient calculation unit 204 to obtain the non-linear distortion compensation data, and further updating according to the digital quadrature baseband feedback signal The coefficients of the calculation formula are formed.

[0041] Therefore, description of the same points as those of the first embodiment will be omitted below, and detailed operations will be described focusing on the differences.

[0042] figure 2 is a block diagram of a transmission device according to a second embodiment of the present invention. The transmitting device according to the second embodiment of the present invention includes: an instantaneous power calculation unit 202, a compensation coefficient calculation unit 204 for calculating data for nonlinear distortion compensation, a nonlinear...

no. 3 Embodiment

[0055] In the transmission device according to the third embodiment of the present invention, the input of the phase / amplitude control unit is changed from the output of the directional coupler 115 to the output of the second quadrature modulation unit 321 . The description of the same points as those of the first embodiment will be omitted below, and the detailed operation will be described focusing on the differences.

[0056] image 3 is a block diagram of a transmission device according to a third embodiment of the present invention.

[0057] The transmitting device of the third embodiment of the present invention includes: an instantaneous power calculation unit 302, a compensation coefficient reference unit 304, a reference table 306, a nonlinear distortion compensation unit 309, a first quadrature modulation unit 311, a power amplifier 313, and a directional coupler 315, 318, second data delay unit 319, second quadrature modulation unit 321, phase / amplitude control uni...

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Abstract

The phase / amplitude control unit controls the phase and amplitude of at least one of the distribution signal distributed by the modulation signal distributor and the reference signal based on the quadrature baseband signal, and the signal synthesizer The synthetic signal is synthesized with the reference signal, and the reference table updating unit updates the nonlinear distortion compensation data based on the A / D converted signal and the quadrature baseband signal of the synthetic signal. With the above structure, the synthetic signal is removed from the known signal components, therefore, the amount of change in the signal input to the A / D conversion means of the feedback system circuit can be reduced without requiring the A / D conversion processing means of the feedback system circuit to have a large Wide dynamic range.

Description

technical field [0001] The present invention relates to a transmission device for compensating nonlinear distortion generated in an amplifier of a transmission system used in a communication device of a wireless communication system using a digital modulation method. Background technique [0002] In recent years, research and development of mobile communication systems using digital modulation methods has flourished. When the amplifier of the transmission system is a high-efficiency amplifier for power saving of wireless terminals, nonlinear distortion is likely to occur, and compensation for nonlinear distortion is necessary. [0003] One method of nonlinear distortion compensation is to use the value of the transmitted baseband signal and refer to the distortion compensation table to perform amplitude and phase nonlinear distortion compensation. In this method, it is possible to track characteristic fluctuations of amplifiers and the like by simply feeding back part of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/20H04B1/04H04L27/36
CPCH03F2201/3233H03F1/3247H04L27/368
Inventor 松冈昭彦高林真一郎村上丰
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA